Episode 1 starts pretty much the way it does, but with Palpatine's evil schemes more clearly shown - no Darth Sidious thing. Let the good guys be good guys and the bad guys be bad guys. There are no gungans. Then they crash in Tatooine and meet a 15 year old Anakin. He lives alone, and no one knows where he is from - he was found by Lars and sold as a slave. There's no C3PO or Artoo. He participates in a race that envolves flying ships, ending in a 4 way melee to death. He gains his freedom and is under Obi-Wan's guidance.Padme is taken hostage by Darth Maul. There's a brief adventure to rescue her, leading up to the battle that kills Qui-Gon.
Episode 2 follows pretty much the story that is told on GL's Episode 2, with Anakin being an older, more experienced Padawan. There's no Jango Fett and the clone army is of Sifo Dias, who was an undercover Sith Lord before Darth Maul. The love story between Padme and Anakin grows of a tension between the two, Anakin not wanting the duty to guard her, but falling in love with her at the same time. they never go back to Tatooine. The final half of the movie is made of the final confrontation on Geonosis, leading to a 3 men battle between Yoda, Obi-Wan and Anakin, versus Dooku. Dooku escapes, but is killed by a mysterious Grievious under Palpatine's orders. Padme shows signs of being very ill, and hides this from Anakin as she marries him secretly.
Episode 3 follows the same story as GL's 3. Padme cannot hide her illness no more, being caused by Palpatine's dark side influences on her. She reveals to be pregnant. Anakin wants to save her life, but cannot do it with the Jedi. Palpatine reveals himself and says that the only way to save Padme is through the knowledge of the dark side. Fooled by Palpatine, he acts in the Jedi purge. Obi-Wan and Mace Windu have an amazing battle with a deadly and always silent General Grievious, which ends up costing Mace Windu's life, who dies at Obi-Wan's arms like Qui-Gon did. However, Mace Windu disapears. Obi-Wan follows Padme, going to Mustafar. There, Anakin fights with Padme, and force-throws her over a pit. Obi-Wan, who was secretly watching it all, saves her from falling into a lava pit, but Anakin belives she is dead. They fight, and the fight ends up the same. Padme is very seriously ill and dying, and dies while giving birth to the twins. She is secretly buried in Naboo. Obi-Wan goes back with Luke on Tatooine, and leaves him with Owen Lars, son of the person who first found Anakin. Qui-Gon and Mace Windu appear to Obi-Wan and tell him the secret of joining with the force. Meanwhile, Vader is consuming himself in self hate for supposedly killing Padme beyond any ways of saving her (he thinks she was consumed by the lava), and his transition to the dark side is complete.